Feed-water heater.



'No. 642,802. Patented Feb. 6, I900.

C. A. NELSON.

FEED WATER HEATER.

(Application filed Oct. 7, 1899.1

(No Model.)

'WW 9% m w UNITED STATES PATENT OFFICE.

CHARLES A. NELSON, OF ALEXANDRIA, MINNESOTA.

FEED-WATER HEATER.

SPECIFICATION forming part of Letters Patent No. 642,802, dated February6, 1900.

Application filed October 7,1899.

To aZZ whom it may concern.-

Be it known that 1, CHARLES A. NELsoN, a citizen of the United States,residing at Alexandria, Minnesota, have invented certain new and usefulImprovements in Feed Water Heaters, of which the following is aspecification.

My invention relates to steam-condensers and feed-water purifiers andsuperheaters to be used in connection with steam-boilers.

The object of the invention is to provide a means for utilizing theexhaust-steam for superheating the feed-water, the former beingcondensed in this action.

The invention comprisesa chamber receiving the exhaust-steam, havinglarge radiation-surfaces and means for passing the feedwater over thesame in its passage to the boiler to superheat said water and condensesaid steam, which is then returned to the boiler.

The invention also includes the details of construction to behereinafter described, and particularly pointed out in the claims.

The invention is illustrated in the accompanying drawings, in whichFigure 1 is a longitudinal sectional view, and Fig. 2 an end elevation.

The device is connected to the boiler in any suitable manner, theexhaust-steam being directed through a pipe 1, discharging into asteam-chamber 1, formed between the outer and inner wall 2 3 of asemicylindrical tank 4, having heads 5. The double walls are closedalong the top at their longitudinal edges by aplate 4, which projectsbeyond the edge of the outer walls 3 and is bent upward to form a flange6, the ends of which are closed by the heads 5 of the tank. Above thetank is a semicylindrical chamber 7, supported by pipe connections 8,leading through the plate at near each head 5. This chamber is formed ofinner and outer walls 9 9 and heads 10, the space between the wall beingvery narrow, forming a narrow elongated chamber. Thischamberisreverselyarranged relative to the tank, and the edges thereofare within the vertical plane of the flanges and a distance above thesame, leaving a clear air-circulating space. The steam passes from thepipe into the chamber 1, through the pipes S into this narrow upperchamber,

Serial NO- 732,962- (No model.)

and circulates between the walls thereof.

Supported on the top of the upper chamber and extending longitudinallythereof is a pipe 10*, which forms the end of the water-feed pipe. Thewater in said pipe runs through. the perforations therein down over thecurved sides of the wall 9 of the upper chamber, being heated bycontacting therewith, and into the flanges 6, which direct the waterinto the tank 4, where it is further heated by the innor wall 2 of thetank. The waterin running over the wall 9 serves to partly cool thesame, which causes the steam passing through the chamber to becondensed. The condensed steam then passes back through the pipes 8 andruns into a trap 11, opening into one end of the chamber 1, from whichit is drawn ofi to the boiler through a branch pipe 12, coupled to themain feed-pipe 13, which leads from the tank 4 and conveys thesuperheated Water therefrom to the boiler. Suitable drain and blow-offpipes may be located near the bottom of the trap and tank to be used incleansing the same of sediment. A pipe 19 leads from the top of theupper steam-chamber to carry 06 the steam not condensed by passingthrough the chamber described. The open space between the ends and sidesof the tank 4 and the upper steam-chamber permits of free aircirculation, which assists in the purifying and condensing action.

I claim 1. In combination, a semioylindrical horizontally-arrangedWater-tank having an open top, and provided with double side walls withan intermediate chamber between the same, an exhaust-steam pipe leadingto said chamber, a second steam-chamber arranged above the first and incommunication therewith, a feed-water pipe above the second chamber,adapted to discharge the feed-water over said second chamber into saidtank and connections leading from the tank and steam-chambers to theboiler, substantially as described.

2. In combination, a semicylindrical tank horizontally arranged, havingdouble side walls forming a narrow steam-space around the water-space insaid tank, a narrow semicircular chamber located above said tank andhaving communication with the steam-chamber thereof, said second chamberbeing reversely arranged relatively to the first chamber and open at itsends inside its inner periphery to provide a free air-circulating space,a feed-water pipe discharging above the second chamber and a pipeconnection between the water-space and steam-chamber in said tank andthe boiler, substantially as described.

3. In combination, a semicylindrical tank having double side wallsforming a steamspace, an exhaust-pipe leading thereto,-a narrowsemicircular steam-chamber arranged above said tank of substantially thesame diameter as said tank and reversely arranged in relation thereto,said chamber forming a top to said tank open throughout to permit anunobstructed air-circulating space, a feedwater-discharge pipe locatedabove said narrow steam'chainber, pipes opening communications betweensaid steam-chamber and a pipe leading from the Water-space andsteamchamber in said tank to the boiler, substantially as described.

4. In combination, the tank having doubled side walls forming asteamchamber, a steam-exhaust pipe communicating therewith, flangesextending along the edges of said tank, a semicylindrical chambersupported above said tank in communication with the first chamber andhaving its longitudinal edges within the plane of said flanges, aperforated feed-pipe supported on said second chamber and a feed-pipeleading from said tank and steam-chambers to the boiler, substantiallyas described.

5. In combination,a water-tank having double walls forming asteam-chamber, an ex-

